Is my severe knee to thigh pain tendinitis?

You might have costochondritis. This is when the cartilage in your ribs gets inflamed, which usually causes pain and tenderness. It may be related to weight loss and sometimes comes on after an illness. To help relieve the pain, you can do some gentle stretching, use heat packs, or take over-the-counter painkillers such as ibuprofen.

It sounds like you have a muscle tear in your calf muscle. This can happen if you overdo it on your muscles or damage them. You may experience symptoms like pain, swelling, and difficulty in leg movement. It is necessary to let your leg rest, apply ice and elevate it to speed up healing. Gentle stretching and physical therapy can also be effective healing methods. Stick to your doctor's recommendations and you are sure to make a complete recovery.

Acupuncture helps in opening up the energy level ( commonly referred as 'Qi' in acupuncture theory).
Acupuncture needles are put on various parts of the body which helps in increasing the blood flow.
It has an anti inflammatory effect. It stops body's inflammatory response, increases blood flow and relaxes muscle tone. It helps in flushing out toxins from the body. Acupuncture releases endorphins which are natural hormones to reduce the feeling of pain and puts the patient in ultimate relaxed state i.e feeling of well being.
Electro acupuncture pulsates electric current through the needles.
Such procedure gives quick response and helps in reducing both pain and inflammation in people with arthritis.

Knee crepitus can be from multiple causes. Painless crepitus can be ignored. So, I won't advice for crepitus knee treatment as such.. Crepitus from knee cap problems can be cured with hip and knee strengthening. Crepitus from cartilage irregularities or loose pieces often need minor keyhole surgery. Painful crepitus from arthritis is initially treated with physical therapy and surgery when therapy stops helping. 

When you mention neck pain for the last 10 days, do you mean a burning sensation in the upper part of your neck? Also, have you felt pins and needles in your left hand and foot? These could be signs of a nerve problem due to the alignment of your neck bones. A medical professional should scan this area to find the exact cause and prescribe the proper treatment, which may include physical therapy or medication if necessary.